C.J. Cherryh has written a great deal in both Science Fiction and Fantasy genres. She participated in the dark fantasy series Thieves' World, creating the vampire-witch, Ischade, among others (I really like Ischade).

Rusalka and Chernevog are grounded in Russian folklore. I found these, at times, to be difficult to read.

Michael likes her science fiction a great deal, but you'll have to take his word for that.